Study Notes On Human Brain


The brain is the most complex part of the human body. This three-pound organ is the seat of intelligence, interpreter of the senses, initiator of body movement, and controller of behavior.
The brain can be divided into three basic units: 
  1. The forebrain, 
  2. The midbrain, and 
  3. The hindbrain

The forebrain is the largest and most highly developed part of the human brain.

The hindbrain controls the body’s vital functions such as respiration and heart rate.
The cerebrum sits at the topmost part of the brain and is the source of intellectual activities. It holds your memories, allows you to plan, enables you to imagine and think. It allows you to recognize friends, read books, and play games.

When one side of the brain is damaged, the opposite side of the body is affected. 

The Inner Brain

The hypothalamus, about the size of a pearl, directs a multitude of important functions. It wakes you up in the morning, and gets the adrenaline flowing during a test or job interview. 

Near the hypothalamus lies the thalamus, a major clearinghouse for information going to and from the spinal cord and the cerebrum.


Neurons are the core components of the brain and spinal cord of the central nervous system (CNS).

Functions of the three parts of a neuron:
Axon: It conducts messages away from the cell body.
Dendrite: It receives information from axon of another cell and conducts the messages towards the cell body.
Cell body: It contains nucleus, mitochondria, and other organelles. It is mainly concerned with the maintenance and growth.


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